(re: red wigglers, found the link I quoted above)
http://www.kitsapezearth.com/fact.html
They say that red wigglers don't digest tomato
seeds. Big deal, something else will (bacteria,
etc.) They say "no eggshells". I always add
eggshells to compost. The worms do not seem
to mind, and the plants likely appreciate the
calcium source, but then I add whatever worms
I find to the compost pile, not exclusively red wigglers.
Maybe compost piles and "worm bins" (for specifically
making and collecting worm castings) have slightly
different requirements (maybe they mean "you do not
want undigested tomato seeds and chunks of eggshell
in your worm castings", although I do not see why that
would be a big problem for the plants that are eventually
fertilized with the worm castings).